The deciliter (dL) is a metric unit of volume equal to one-tenth of a liter, used in medical lab reports and some European recipes. Blood test results in many countries express cholesterol and glucose levels in milligrams per deciliter, making this unit familiar to anyone reviewing health data. One deciliter equals exactly 100 milliliters or roughly 3.381 fluid ounces.

The UK gallon (imperial gallon) equals exactly 4.54609 liters, about 20% larger than the US gallon, and remains the standard fuel measurement in the United Kingdom and some Commonwealth nations. British fuel efficiency is expressed in miles per imperial gallon, which yields higher numbers than the US equivalent. One UK gallon equals approximately 1.201 US gallons.